ANDROID: GKI: Resolve ABI diff for struct snd_usb_audio

Adds member 'struct mutex dev_lock' to struct snd_usb_audio.

Test: build
Bug: 151372815
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Change-Id: I9aafd93924025e71ef1362ea225396593cd64872
(cherry picked from commit f055b3843f78a67497bbab7da5ea6405823bb861)
[hridya: partial cherry-pick from snapshot change]
Signed-off-by: Hridya Valsaraju <hridya@google.com>